Karl-georg Bernhardt - Academia.edu (original) (raw)

Papers by Karl-georg Bernhardt

Scientific Reports

The Euro-Siberian steppe flora consists of warm- and cold-adapted species, which may have respond... more The Euro-Siberian steppe flora consists of warm- and cold-adapted species, which may have responded differently to Pleistocene glacials and interglacials. Genotyping-by-sequencing individuals from across the distribution range of the pheasant’s eye (Adonis vernalis), we aimed to gain insight into steppe florogenesis based on the species’ evolutionary history. Although the primary area of origin of the species group comprising A. vernalis, A. villosa and A. volgensis is in Asia, our results indicate that recent populations of A. vernalis are not of Asian origin but evolved in the southern part of Europe during the Pleistocene, with Spanish populations clearly genetically distinct from the Southeastern European populations. We inferred that A. vernalis migrated eastwards from the sub-Mediterranean forest-steppes of Southeastern Europe into the continental forest-steppe zone. Eastern European populations had the highest private allelic richness, indicating long-term large population si...

A long term farming system monitoring was established in the Eastern region of Austria in 2003, t... more A long term farming system monitoring was established in the Eastern region of Austria in 2003, the first year of conversion to organic farming. The goal was to evaluate the performance of organic arable farming and its biotopes (flowering stripes, hedges and tree rows), and specifically their impact on biodiversity. After nine years of organic farming we note a considerable increase of biodiversity in the arable fields and accompanying biotopes. Indicators applied were soil fauna, breeding birds as well as weeds. Space-time aspects, rotation and management measures as well as crop specific characteristics were influencing the development of species diversity. The development of diversity however is limited due to the intense farming in the past and in the farm surroundings.

Edinburgh Journal of Botany, 2019

To date, there are very few sequence data for Cyperaceae from mainland Southeast Asia. The aim of... more To date, there are very few sequence data for Cyperaceae from mainland Southeast Asia. The aim of the present study was to contribute nuclear ribosomal internal transcribed spacer (ITS) sequences of selected species of Cambodian Cyperaceae to the overall phylogeny of the family. We generated ITS sequences of 38 accessions representing 26 species from Cambodia and used these sequences for phylogenetic analysis together with similar sequences from the National Center for Biotechnology Information GenBank. Our results corroborate recent phylogenetic work in the family and largely confirm established tribal relationships. The backbone of the phylogenetic tree of species-rich genera that have undergone rapid radiations is often weakly resolved (e.g. in Fimbristylis and in the C4 clade of Cyperus). Cryptic variation was revealed in the taxonomically difficult group of Fimbristylis dichotoma, with samples of this taxon appearing in two distinct clades within Fimbristylis. Further addition ...

Folia geobotanica et phytotaxonomica, Sep 1, 1986

BERNHARDT K. G. (1986): Mosaic vegetation characteristic of the prehistoric lava fields of the "H... more BERNHARDT K. G. (1986): Mosaic vegetation characteristic of the prehistoric lava fields of the "Hekla" area near Oaltalcakur, Iceland.-FoIia Geobot. Phytotax., Praha, 21: 243-248.-A successional vegetation mosaic occurring on a prehistoric lava field of the Hekla volcano is described. The unique lava formation is associated with two vegetation types, distinct ~oristically as well as phyt osociologically. :In one vegetation type cryptogams dominate; the other is dominated by small leaved graminoids and chsmaei:hytic plants.

In einem typischen Biotopkomplex des Kernmünsterlandes, im Werseraum, wird die Wanzen- und Zikade... more In einem typischen Biotopkomplex des Kernmünsterlandes, im Werseraum, wird die Wanzen- und Zikadenfauna untersucht. Dargestellt werden die räumlichen, strukturellen und zeitlichen Verteilungsmuster innerhalb des Untersuchungsgebietes, außerdem werden Angaben zur Verbreitung gemacht.

Im südlichen Teil des nordwestdeutschen Tieflandes sowie in Bremen wurde die Verbreitung und Ökol... more Im südlichen Teil des nordwestdeutschen Tieflandes sowie in Bremen wurde die Verbreitung und Ökologie der Gattung Saldula (Saldidae, Heteroptera) untersucht. Bisher konnten 12 Vertreter der Gattung nachgewiesen werden. Neben zwei eurytopen Arten (S. saltatoria, S. orthochila) zeigten die übrigen Vertreter deutliche Biotoppräferenzen. S. arenicola besiedelt vegetationsarme Sandböden, S. vestita und S. c-album leben in den Uferbereichen großer Flüsse, S. pallipes bevorzugt Lehmböden.

International Journal of Biometeorology, Jun 1, 1989

Applications in Plant Sciences, Oct 1, 2017

BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access t... more BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Die meisten Funde stammen aus dem Marchfeld (Niederösterreich), und zwar bei Rutzendorf (leg. K.-... more Die meisten Funde stammen aus dem Marchfeld (Niederösterreich), und zwar bei Rutzendorf (leg. K.-G. Bernhardt, leg. Laubhann, leg. Neugebauer, Herb. WHB) und bei Gänserndorf (leg. Bernhardt, Herb. WHB). Westlich von Wien wurde die Art an zwei Fundorten gefunden, nämlich bei Trasdorf und bei Zwentendorf (leg. K.-G. Bernhardt; Herbar K.-G. B.). Bei allen Fundstellen handelt es sich um Segetalstandorte, entweder um Brachäcker oder Futtererbsenkulturen u. ä., dementsprechend sind die Begleiter Segetalarten. Die Tab. 1 gibt eine Übersicht über die soziologische Einbindung der Art. Die z. T. sehr fragmentarischen Bestände können dem Stachyo annui-Setarietum pumi

Plants, Apr 25, 2021

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Ecology and Evolution, Mar 17, 2020

This is an open access article under the terms of the Creative Commons Attribution License, which... more This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Aquatic Botany, Sep 1, 2021

We studied fruit morphology, germination and growth of juvenile plants and clonal ramets of the n... more We studied fruit morphology, germination and growth of juvenile plants and clonal ramets of the non-native species Typha laxmannii and the two common native species Typha angustifolia and Typha latifolia in Lower Austria by means of morphological measurements, germination tests in an environmental test chamber and garden experiments with different water and nutrient levels. The ecological niche of T. laxmannii was close to the niches of the native species T. latifolia and T. angustifolia. All species were light-dependent and quick germinating under suitable conditions. Fruit morphology of T. laxmannii was very similar to that of T. angustifolia, but viability and germination of T. laxmannii were comparable to that of T. latifolia. All three species were profiting from higher water and nutrient levels in the experiments. Only minor advantages or disadvantages of T. laxmannii compared to the native species were detected, hence a direct replacement of them is not expectable. Additional factors like the availability of diaspores in the study area of the Tullnerfeld and Danube valley could be more crucial for the present distribution of T. laxmannii than differences in ecological niches of species themselves.

Biodiversity and Conservation, Jan 21, 2011

Kochia, Feb 21, 2019

From all parts of the world-neophytic Typha in Central Europe. In Central Europe neophytic Typha ... more From all parts of the world-neophytic Typha in Central Europe. In Central Europe neophytic Typha species have established themselves largely unnoticed. This development was initiated by garden supply trade providing Typha for ponds and biotopes. Determination characters of these neophytic Typha species are presented in order to create more awareness using Typha species.

Nordic Journal of Botany, Jul 1, 1995

This investigation shows the role of soil digging beetles (Carabidae, Heteroceridae) in burial of... more This investigation shows the role of soil digging beetles (Carabidae, Heteroceridae) in burial of myxospermous seeds. Field experiments with containers filled with sterilized sand, seeds of different plant species and soil digging beetles, are used. After six months in plots with digging insects seeds were found in deeper soil depths (up to 10 cm soil depth) than seeds in control plots. The study was done with beetles belonging to newly created sandy land. The study shows that beetles can be important for seed dispersal and seed burial and that seeds deep in the soil do not need to be old.

Basic and Applied Ecology, 2003

We investigated the distribution of genetic diversity in the strictly outcrossing plant species C... more We investigated the distribution of genetic diversity in the strictly outcrossing plant species Cardamine amara using isozyme analysis. We investigated 36 populations from an area of approximately 900 square kilometres in a geographically well-defined region in Northwestern Germany. For these 36 populations we did not find any geographical structuring of genetic diversity. For ten out of the 36 populations we compared the genetic diversity of established population and soil seed bank from two different depths. At these ten sites we also studied differences in the species composition of soil seed bank and of established vegetation as an indicator of environmental dynamics. The corresponding results indicate that increasing dynamics of the habitat decreased the similarity between aboveground vegetation and soil seed bank and the homogeneity of the vertical distribution of seeds. Moreover, increasing environmental dynamics non-significantly increased heterozygosity. In typical, disturbed wet woodland habitats, Cardamine amara established a long-term persistent seed bank with up to 35,900 seeds m-2. Here the overall genetic diversity stored in the seed bank was similar to the one of the actually established population. Nevertheless, wet woodland seed bank subpopulations from different depths were more similar to each other genetically than compared to the established populations. Most established and seed bank populations were genetically close to Hardy-Weinberg equilibrium. Our study demonstrates that established C. amara populations do not represent simple representative genetic subsets of the underlying seed banks. 36 Populationen von Cardamine amara, dem Bitteren Schaumkraut, aus einem etwa 900 Quadratkilometer umfassenden Gebiet in Nordwest-Deutschland wurden mit Hilfe von Isoenzymanalysen auf ihre genetische Variabilität hin untersucht. Räumliche Verteilungsmuster der genetischen Variabilität konnten allerdings nicht nachgewiesen werden. Für 10 Populationen wurde die genetische Variabilität der aktuellen, überirdischen Teilpopulation mit derjenigen des zugehörigen Bodensamenspeichers untersucht. An diesen Standorten wurde der gesamte Bodensamenspeicher mit der aktuellen Vegetation verglichen, um Hinweise auf das Ausmaß der Dynamik der durch Wasser geprägten Lebensräume zu bekommen. Entsprechende Ergebnisse zeigen, dass eine zunehmende standörtliche Dynamik zu einer sinkenden floristischen Ähnlichkeit zwischen aktueller Vegetation und dem Bodensamenspeicher führt. Demgegenüber stieg der Heterozygotiegrad als genetischer Parameter mit steigender Dynamik. In typischen Cardamine amara dominierten Naßwäldern baut diese Art einen Bodensamenspeicher mit bis zu 35.900 Samen pro m 2 auf. Die genetische Diversität von Bodensamenspeicher und aktueller Vegetation war identisch, es wurden dieselben Multilocusgenotypen gefunden. Unterschiede ergaben sich aber in den Allelfrequenzen. Dieses führte